It's actually far superior. X11 only provides frames of the display so you can't do h.264 encoding on RDP streams. With Wayland the compositor provides a stream of the window whether it's video or a game. The RDP protocol encodes it in h264 and you get much lower latency and frame loss. X11 can forward a socket but you get no clipboard, no audio, nothing except key strokes and frames. It's not encrypted. Doesn't scale. Have to use SSH tunneling. And good luck having any influence on what the physical displays are showing. You can only do a virtual display or a physical one but not both.

This RDP implementation has clipboard sharing and audio integration. It spawns in a user session but it actually locks the real screens and creates a virtual display. You can make as many virtual displays as you want. In theory you can attach to a single window or rectangular area of the screen. Also it works perfectly fine with SDDM Autologin so you can spawn a display on your server and just auto unlock it.

The project is actually awesome. It's a holistic and far superior RDP solution to anything in the Linux space before.